EP0069840A1 - Moniteur pour télévision en couleur - Google Patents

Moniteur pour télévision en couleur Download PDF

Info

Publication number
EP0069840A1
EP0069840A1 EP82103927A EP82103927A EP0069840A1 EP 0069840 A1 EP0069840 A1 EP 0069840A1 EP 82103927 A EP82103927 A EP 82103927A EP 82103927 A EP82103927 A EP 82103927A EP 0069840 A1 EP0069840 A1 EP 0069840A1
Authority
EP
European Patent Office
Prior art keywords
capacitor
television monitor
demagnetization
color television
color
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP82103927A
Other languages
German (de)
English (en)
Inventor
Otto Ing. Grad. Diethelm
Bernd Ing. Grad. Meyer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Blaupunkt Werke GmbH
Original Assignee
Blaupunkt Werke GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Blaupunkt Werke GmbH filed Critical Blaupunkt Werke GmbH
Publication of EP0069840A1 publication Critical patent/EP0069840A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H04N9/29—Picture reproducers using cathode ray tubes using demagnetisation or compensation of external magnetic fields

Definitions

  • the invention relates to a color television monitor for vehicle operation with a switchable demagnetization device for the color picture tube.
  • a demagnetizing circuit is also switched on, which sends a decaying alternating current through the demagnetizing coils on the color picture tube.
  • the person skilled in the art is familiar with the need to demagnetize color picture tubes in order to avoid visible disturbances in the color purity after certain changes in the location of the color television set.
  • the inventors propose to design color television sets or monitors in accordance with the preamble of the main claim in accordance with the features of the main claim and, if appropriate, also to use the features of the features of the subclaims.
  • the measure according to the invention ensures that the color purity of the image reproduction is maintained and measures for this are hardly noticeable.
  • FIG. 1 shows the block diagram of a known color television monitor
  • FIG. 2 shows a circuit for improving the color television monitor according to FIG. 1 according to the invention.
  • the input signal for this input stage can also be formed by the output signal of an upstream receiver part.
  • the structure can be omitted here, since its configuration is of secondary importance for the invention.
  • the signal is passed from the input stage 1 over an amplitude sieve 2, in which the synchronizing signals are separated from the picture content.
  • the amplitude screen 2 is followed by the image intensifier 3, the output signal of which is fed to the picture tube 5 via the RBG control 4.
  • the deflection circuit 6 is connected to the amplitude filter 2, which u. a. the vertical stage 7 comprises.
  • the deflector unit 8 on the neck of the picture tube 5 is u. a. connected to this vertical stage 7.
  • the power supply unit 9 supplies the various operating voltages for the color television monitor.
  • a demagnetization circuit 10 is connected to the demagnetization stage 11 on the piston 12 of the picture tube 5. According to the prior art, a decaying current surge is sent through the demagnetizing coil when the color television monitor is switched on and has essentially subsided after 2.5 ms.
  • a demagnetization circuit constructed according to the invention is shown in FIG. 2.
  • the demagnetizing coil 11 forms, together with the capacitor 13, a parallel resonant circuit to which a diode 14 is connected in parallel. Via a charging resistor 15, this resonant circuit is at a voltage of approximately 800 volts, e.g. B. the screen grid voltage.
  • a thyristor 16 is located antiparallel to the diode 14 and is ignited by the circuit connected via the resistor 17. When the thyristor is triggered, the capacitor 13 is discharged, which was previously charged to 800 volts. As a result, the parallel resonant circuit damped by the series resistance of the demagnetizing coil 11 is excited to a strongly damped vibration.
  • Damped vibration is essential for demagnetization.
  • the duration of the demagnetization process is determined by the inductance of the demagnetization coil 11, its series resistance and the size of the capacitor 13.
  • the size of the resistor 15 and the size of the capacitor 13 together, on the other hand, determine the time required for the capacitor to be recharged after the damped oscillation has subsided.
  • the ignition of the thyristor 16 is effected by an ignition pulse from the ignition generator 18.
  • the ignition generator 18 contains a capacitor 19 which supplies the required ignition energy.
  • the discharge of this capacitor - which is initially charged when the device is switched on via the resistor 20 - is initiated via a pulse shaping stage 21 by an image synchronizing pulse, which as such follow one another at a time interval of 20 ms.
  • image synchronization pulses are either taken directly from the amplitude sieve 2 or generated from the sawtooth of the vertical deflection stage 7.
  • the ignition pulses are also fed to a repeater circuit 22, which essentially consists of a Mnno flop 23 and a pulse shaper 24 connected to its output.
  • the collector of the transistor in the pulse shaping stage 24 is connected to the high point of the capacitor 19. During the service life of the mono-flop, the transistor in the implusformer 24 is blocked, so that the capacitor 19 can only be charged after the service life of the mono-flop, when the pulse shaper 24 has been conductive.
  • the next frame sync pulse can initiate the discharge of the capacitor 19 and thus trigger an ignition pulse for the transistor again.
  • the required amount of capacitor charge is determined via the transistors 25, 26 and the size of the sync pulse itself.
  • the circuit is dimensioned such that, on the one hand, demagnetization takes place essentially within the blanking interval, so that even with frequent repetitions of the demagnetization during playback, no disturbances occur in the reproduced image and, on the other hand, the mono-flop 23 is designed such that the demagnetizations themselves in time
  • the idea of the invention naturally permits a large number of exemplary embodiments.
  • the exemplary embodiment described above has been tested in a device and is intended for series production.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Color Television Systems (AREA)
EP82103927A 1981-07-10 1982-05-06 Moniteur pour télévision en couleur Withdrawn EP0069840A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3127299 1981-07-10
DE19813127299 DE3127299A1 (de) 1981-07-10 1981-07-10 Farbfernsehmonitor

Publications (1)

Publication Number Publication Date
EP0069840A1 true EP0069840A1 (fr) 1983-01-19

Family

ID=6136613

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82103927A Withdrawn EP0069840A1 (fr) 1981-07-10 1982-05-06 Moniteur pour télévision en couleur

Country Status (4)

Country Link
EP (1) EP0069840A1 (fr)
JP (1) JPS5824291A (fr)
DE (1) DE3127299A1 (fr)
ES (1) ES8305548A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2555385A1 (fr) * 1983-11-17 1985-05-24 Rca Corp Demagnetisation resonnante sans magnetisme residuel
EP0144531A1 (fr) * 1983-12-13 1985-06-19 Blaupunkt-Werke GmbH Appareil de télévision en couleurs
EP0183513A3 (en) * 1984-11-30 1987-08-19 Rca Corporation Resonant degaussing for a video display system
EP0282290A3 (en) * 1987-03-13 1990-12-19 Rca Licensing Corporation Resonant degaussing apparatus
EP0449626A1 (fr) * 1990-03-28 1991-10-02 Kabushiki Kaisha Toshiba Circuit de démagnétisation
EP0449108A3 (en) * 1990-03-27 1992-10-21 Ferguson Limited Degaussing circuit for a picture tube

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56168420U (fr) * 1980-05-16 1981-12-12
US4671370A (en) * 1984-03-05 1987-06-09 Gkn Automotive Components Inc. Independent wheel suspension system using thrust bearing constant velocity universal drive joints, bending and torsional motion resistance suspension members and a transversely pivotable differential
DE3718734C2 (de) * 1987-06-04 1994-07-21 Broadcast Television Syst Farbfernsehkamera
KR100202640B1 (ko) * 1995-12-07 1999-06-15 구본준 씨알티의 잔류자속 제거방법
US5755037A (en) * 1996-03-18 1998-05-26 Great Neck Saw Manufactures, Inc. Level

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1554575A (fr) * 1966-02-25 1969-01-24

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1554575A (fr) * 1966-02-25 1969-01-24
US3439211A (en) * 1966-02-25 1969-04-15 Television Cie Franc De Periodic demagnetization of color cathode ray tube aboard moving vehicle

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2555385A1 (fr) * 1983-11-17 1985-05-24 Rca Corp Demagnetisation resonnante sans magnetisme residuel
EP0144531A1 (fr) * 1983-12-13 1985-06-19 Blaupunkt-Werke GmbH Appareil de télévision en couleurs
EP0183513A3 (en) * 1984-11-30 1987-08-19 Rca Corporation Resonant degaussing for a video display system
EP0282290A3 (en) * 1987-03-13 1990-12-19 Rca Licensing Corporation Resonant degaussing apparatus
EP0449108A3 (en) * 1990-03-27 1992-10-21 Ferguson Limited Degaussing circuit for a picture tube
EP0449626A1 (fr) * 1990-03-28 1991-10-02 Kabushiki Kaisha Toshiba Circuit de démagnétisation
US5357398A (en) * 1990-03-28 1994-10-18 Kabushiki Kaisha Toshiba Degaussing circuit

Also Published As

Publication number Publication date
ES513862A0 (es) 1983-04-01
DE3127299A1 (de) 1983-02-03
JPS5824291A (ja) 1983-02-14
ES8305548A1 (es) 1983-04-01

Similar Documents

Publication Publication Date Title
EP0069840A1 (fr) Moniteur pour télévision en couleur
DE2238548C3 (de) Hochspannungsregelschaltung für Fernsehempfänger
DE2633237C3 (de) Einschalt-Stromversorgungsschaltung für einen Fernsehempfänger
DE3421524C2 (de) Horizontalablenkschaltung
DE3943212A1 (de) Ausgangsverstaerker mit zwei stromquellen
DE69124011T2 (de) Anzeigevorrichtung
DE910673C (de) Anordnung zur Zufuehrung von Betriebsspannungen an Schaltungsteile, die gegenueber ihrer Umgebung hohe Wechselspannungen fuehren
DE3129293C2 (fr)
DE1514342A1 (de) Elektromagnetische Strahlablenkschaltung
DE3722448C2 (fr)
DE950561C (de) Anordnung mit einer Kathodenstrahlroehre
DE2111217B2 (de) Vertikalablenkschaltung mit Kissenverzeichnungskorrekturschaltung
DE2321149B2 (de) Dyna mische Vertikal-Konvergenzschaltung
DE69320727T2 (de) Wiedergabeanordnung mit Reduktion des elektrischen Feldes
DE1237699B (de) Schaltungsanordnung zur Erzeugung einer einstellbaren Gleichspannung fuer eine Kathodenstrahlroehre
DE3528893C2 (de) Vorspannungsanordnung für ein Bildwiedergabegerät
DE2003403C3 (de) Testsignalge nerator
DE2915032A1 (de) Selbstregulierende ablenkschaltung mit widerstandsdiodenvorspannung
EP0103709B1 (fr) Dispositif de circuit pour la correction de la distorsion latérale en coussin
DE1803962C3 (de) Abtastverfahren für eine Fernsehkamera
DE882252C (de) Schaltung zur Abnahme der Steuerspannungen fuer die Zeilen- und Zeilenzugablenkung in Fernsehempfaengern
DE2721756C3 (de) Kombinierter Haupt- und Nebenfernsehempfänger
DE2838819B2 (de) Farbbildwiedergabeanordnung mit einer Schaltungsanordnung zum Erzeugen einer Schirmgitterspannung
DE2451027A1 (de) Fernsehablenkspule
DE2325370A1 (de) Spannungsregler fuer eine ablenkschaltung

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT CH FR GB IT LI SE

17P Request for examination filed

Effective date: 19830614

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19830915

RIN1 Information on inventor provided before grant (corrected)

Inventor name: DIETHELM, OTTO, ING. GRAD.

Inventor name: MEYER, BERND, ING. GRAD.